Sensor technical parameters - Database & Sql Blog Articles

inductance

Detailed technical parameters of the sensor

(1) Sensor technology - rated load: The rated load of the sensor means that when designing the sensor,

The maximum axial load that can be measured within the specified specifications. However, in actual use, only 2/3~1/3 of the rated range is generally used.

(2) Sensor technology - allows the use of load (or safety overload): the maximum axial load that the sensor allows. Allows overload work within a certain range. Generally it is 120%~150%.

(3) Sensor technology - ultimate load (or extreme overload): The maximum axial load that the sensor can withstand without losing its ability to work. This means that the sensor will be damaged when the work exceeds this value.

(4) Sensor technology - sensitivity: The ratio of the output increment to the added load increment. Usually the mV of the rated output per input of 1V voltage. When the company's products are matched with other company's products, the sensitivity coefficient must be the same.

(5) Sensor Technology - Nonlinear: This is a parameter that characterizes the accuracy of the correspondence between the voltage signal output from this sensor and the load.

(6) Sensor technology - repeatability: repetitive characterization of the sensor when the same load is repeatedly applied under the same conditions,

Whether the output value can be repeated or not is more important and reflects the quality of the sensor. The national standard indicates the error of repeatability: the repeatability error can be measured simultaneously with the nonlinearity. The repeatability error (R) of the sensor is calculated as follows: R = ΔθR / θn × 100%. ΔθR -- The maximum difference (mv) between the actual measured signal values ​​measured 3 times at the same test point.

(7) Sensor technology - hysteresis: The common meaning of hysteresis is: when the load is applied step by step and then the load is sequentially removed, the corresponding load should be the same for each level of load. In fact, the degree of inconsistency is consistent with the hysteresis error. An indicator to indicate. In the national standard, the hysteresis error is calculated as follows: the hysteresis error (H) of the sensor is calculated as follows: H = ΔθH / θn × 100%. ΔθH - the maximum difference (mv) between the arithmetic mean of the actual output signal values ​​of the three strokes at the same test point and the arithmetic mean of the actual output signal values ​​of the three upstrokes.

(8) Sensor technology - creep and creep recovery: It is required to test the creep error of the sensor from two aspects: one is creep: no impact after 5-10 seconds plus the rated load after loading 5 The ~10 second reading then records the output value in sequence at a certain time interval within 30 minutes. The sensor creep (CP) is calculated as follows: CP = θ2 - θ3 / θn × 100%. The second is creep recovery: as soon as possible to remove the rated load (in 5 to 10 seconds) unloading, immediately within 5 to 10 seconds of reading and then record the output value at a certain time interval within 30 minutes. The creep recovery (CR) of the sensor is calculated as follows: CR = θ5 - θ6 / θn × 100%.

(9) Sensor technology - allowable temperature: specifies the application where this sensor can be applied. The normal temperature sensor is generally labeled as: -20 ° C --- +70 ° C. The high temperature sensor is labeled: -40 ° C --- 250 ° C.

(10) Sensor technology - temperature compensation range: This sensor has been compensated for in such temperature range at the time of production. The ambient temperature sensor is generally labeled as -10 ° C - + 55 ° C.

(11) Sensor technology - zero temperature effect (commonly known as zero temperature drift): characterizes the stability of the zero point of this sensor when the ambient temperature changes. Generally, the drift generated in the range of 10 ° C is a unit of measurement.

(12) Sensor technology - temperature influence of output sensitivity coefficient (commonly known as coefficient temperature drift): This parameter characterizes the stability of the output sensitivity of this sensor when the ambient temperature changes. Generally, the drift generated in the range of 10 ° C is a unit of measurement.

(13) Sensor technology - output impedance: When the company's sensor is used in parallel with other manufacturers' sensors, it must be clear that the output impedance of the company's product must be consistent with this value. Otherwise it will directly affect the output characteristics of the electronic scale and the debugging of the four-angle error.

(14) Sensor technology - input impedance: the input resistance of the sensor is greater than the output resistance due to the sensor's input mode elastic compensation resistor and sensitivity coefficient adjustment resistor.

However, it can be changed by a parallel resistance method. It is required that the input impedance of each sensor is consistent if it matches the sensor of other manufacturers. The input impedance should be consistent with it. Otherwise, the working time will be increased when debugging the four-corner error. Because the input impedance of the sensor is a load for the regulated power supply, the same regulated power supply will provide the same power supply voltage.

(15) Sensor technology - Insulation resistance: The insulation resistance is equivalent to a resistor between the bridge and the ground. The resistance of the resistor is equivalent to the size of the resistor. When the insulation resistance is lower than a certain value, the bridge will not work properly.

(16) Sensor technology - recommended excitation voltage: generally 5 ~ 10 volts. Because the regulated power supply in the general weighing instrument is 5 or 10 volts.

(17) Sensor technology - maximum excitation voltage allowed: In order to increase the output signal, in some cases (such as large tare weight), it is required to use a larger excitation voltage to obtain a larger signal.

(18) Sensor technology - cable length: It must be clear about the regular cable length of the company's products before ordering. Also pay attention to whether the environment is corrosive, whether there is impact, whether it is high temperature or low temperature.

(19) Sensor technology - Sealing protection class IP67: The effect of impregnation water is not affected by the immersion in water at the specified pressure and time. The glue-protected sensor can reach IP67. In addition to oil and water resistance, it can also prevent corrosive media such as corrosive gases. Beijing Furui Hengchuang Technology Co., Ltd.